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ID:38245282
大小:388.61 KB
页数:5页
时间:2019-06-01
《西气东输焊接工艺规范》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、西气东输二线工程X80钢管半自动焊工艺研究黄福祥。,隋永莉,曾惠林(1.天津大学材料学院,天津300072;2.中国石油天然气管道科学研究院,河北廊坊065001)摘要:以西气东输二线工程用X80钢管为研究对象,通过焊接接头横向拉伸试验,焊缝和热影响区(HAZ)冲击韧性试验,焊缝和HAZ不同焊层显微组织分析,以及焊接接头不同焊层HvlO硬度试验等手段,研究了低氢型焊条根焊和自保护药芯焊丝半自动填充、盖面组合焊接工艺的环焊缝的焊接接头性能。试验结果表明,选择韧脆转变温度较低的自保护药芯焊丝、采用较小的焊接热输入量和多层多道的焊接措施等因素,对于保证X80钢管环焊接头的性能是至关
2、重要的。采用低氢焊条根焊、自保护药芯焊丝半自动焊进行X80钢管焊接时,焊接接头的强度、一l0℃低温冲击韧性和硬度等性能良好,该工艺应用于西气东输二线工程的焊接施工是可行的。关键词:X80钢管;环焊接头;自保护药芯焊丝电弧焊;半自动焊中图分类号:TG457.6文献标识码:A文章编号:1001—4837(2009)05—0013—05doi:10.3969/j.issn.1001—4837.2009.05.002ResearchonX80PipelineSteelSemi——automaticWeldingforWesttoEastGasPipelineIIProjectHUAN
3、GFu—xiang一.SUIYong一li.ZENGHui—lin’(1.SchoolofMaterialScienceandEngineering,TianjinUniversity,Tianjin300072,China;2.PipelineResearchInstituteofCNPC,Langfang065001,China)Abstract:TakingtheX80steelpipeutilizedinWesttoEastGasPipelineIIProjectastheresearchob-ject,thispaperstudiestheperformanceof
4、circumferentialweldingjointundertheweldingprocesswhichcombinedwithlow—hydrogenelectrodeforrootwelding,self—shieldedfluxcoredarcweldingforsemi—automaticfillingandcapping,throughseveralmethodssuchasthelateraltensiontesttoweldjoint,theimpacttoughnesstesttoweldseamandheat—affectedzone(HAZ),them
5、icrostructureanalyzestodif-ferentlayersofweldjointandHAZ,aswellastheHvlOhardnesstesttodifferentlayersofweldjoint.Thetestresultindicatesthat,inordertoguaranteethecircumferentialweldingjointperformanceofX80steelpipe,itgsignificanttochooseself—shieldedflux—coredwirewithlowtoughnessandbrittlene
6、sstransitiontemperature,applylessweldingheatinputvalueandothermeasuressuchasmulti—layeredandmulti—passwelding.Usethelow—hydrogenweldingrodforrootweld.self—shieldedflux—coredweldingwireforsemi—automaticweldingtocarryonX80steelpipewelding,theintensity,impacttoughnessunder一10~Clowtemperaturean
7、dhardnessperformanceofweldjointsaregood.ItsfeasibletoapplythisweldingprocessforweldingconstructioninWesttoEastGasPipelineIIProject.Keywords:X80line—pipe;circumferentialweldingjoint;self—shieldedfluxcoredarcwelds;semi—au—tomaticwelding·13·CPVT西气东输二线工程X80钢
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